The world's largest kaleidoscope, designed by a 1960s psychedelic artist.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

A park full of outsider art, created by college students studying outsider art.

One of the first commercially successful anthracite-powered iron-making operations in North America.

An otherwise quiet campground becomes a bustling medieval town for two weeks every year.

An abandoned railroad tunnel transformed into a creepy path for hikers and cyclists.

Locals call this magical moss-covered walkway the "Emerald Path."

Dozens upon dozens of boulders engraved with scripture tell the story of one man's troubled life.

A soon-to-be-forgotten roadside spectacle loaded with local lore.

No one knows who painted this mysterious mural in a Penn State basement.

Penn State's giant bug collection.

This 19th century machine put animals (including humans) in boxes to study how they metabolized calories.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

This abandoned iron furnace was one of the first to use coke—a type of high-carbon fuel—to make iron.

A retired firefighter created this contraption so he and his family wouldn't die if accidentally buried alive.

According to local myth this cemetery is half evil spirits, half good—split down the middle.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

Intricate storybook scenes are tucked inside these shadow boxes, which are tucked inside a library in the Pocono Mountains.

The final resting place of the Hollywood star who came to a tragic end.

This park contains a number of standing stones meant to heal and inspire.

This huge, disused viaduct is now a crumbling concrete underworld of covered in years of graffiti.

Once the world's largest reinforced concrete structure, this abandoned bridge now beckons urban explorers.

Local lore claims this park is named after a young woman who jumped off a cliff.